Forty two people were hurt after a railing collapsed during a concert by Snoop Dogg and Wiz Khalifa in New Jersey.
A partition separating concertgoers from the stage at the BB&T Pavilion in Camden collapsed, causing people to fall onto the concrete below.
It happened shortly before 10:30pm local time on Friday.
One fan suffered a serious upper body injury and remained in hospital on Saturday in a stable condition.
Numerous other people were treated for broken bones, bruises and other injuries.
The railing was separating a sloping lawn from a covered portion of the outdoor concert hall. The lawn is several feet above a concrete walkway.
Concertgoer Katie Colbridge said the event, which was about halfway finished, stopped abruptly when the accident happened.
It was later cancelled.